Search result page : WP_Query with custom fields

Hi everyone.

I’m working on a cooking website.
I needed to add a custom field “ingredient” to my posts, so I installed the ACF Pro (advanced custom fields) plugin.
I added a Repeater text field “ingredients”, so now I can add 1 or more ingredients to each post.

I created a search form with 3 text fields (each one corresponding to an ingredient).
Basically the idea is to display only the posts containing exactly those 3 ingredients (or less if only one or 2 fields are filled).

My problem is about using Wp_query to display the good posts.

In the database, I can easily find those ingredients in the ‘postmeta’ table.
It looks like this :

meta_key : ingredient_recipe_0_ingredient
meta_value : potato

meta_key : ingredient_recipe_1_ingredient
meta_value : carrot

meta_key : ingredient_recipe_2_ingredient
meta_value : salt

meta_key : ingredient_recipe_3_ingredient
meta_value : creme

There is also that line (which shouldn’t be useful in this case I think) :

meta_key : ingredient_recipe
meta_value : 4

Now my problem :

If someone fills the 3 text fields with “potato”, “creme”, “garlic”, I would like to execute a query which finds the posts that contain at least those 3 ingredients.
I tried to use WP_Query and WP_Meta_Query to do that, but I cannot find a way.

In SQL, my query should look like this :

SELECT * FROM wp_posts
WHERE ID IN (
	SELECT post_id FROM wp_postmeta
	WHERE meta_key LIKE 'ingredient_recipe_%'
	AND meta_value = 'potato')

AND ID IN (
	SELECT post_id FROM wp_postmeta
	WHERE meta_key LIKE 'ingredient_recipe_%'
	AND meta_value = 'creme')

AND ID IN (
	SELECT post_id FROM wp_postmeta
	WHERE meta_key LIKE 'ingredient_recipe_%'
	AND meta_value = 'garlic')

The problem is the “LIKE” part of the object WP_Meta_Query.
I think it’s only possible to do a “LIKE” comparaison on the meta_value. I didn’t find how to do it on the meta_key.

This is what I tried :

$meta_query = new WP_Meta_Query(array(
				array(
					'key'     => 'ingredients_recette_%',
					'value'   => 'potato',
					'compare' => 'LIKE'
				)
			));

But I think the SQL equivalent is this :

SELECT post_id FROM wp_postmeta
WHERE meta_key = 'ingredient_recipe_%'
AND meta_value LIKE 'potato'

Is there a way to do that?
Thanks in advance.