How do I check for a value on an array line

I want to check for a value in my array on a certain axis, I.E positions (1,0) (1,1), (1,2)... for my inventory. As I want to check for item ID's but the second line of the array (the one that defines the amount of an item in the inventory) is interfering

ID is on X ? Amount is on Y ?

Store as

(action) Set at XY .. x = id .. y = 1

Retrieve as

(expression) Array.At(id,1)

Compare as

(condition) Compare at XY .. X = id .. Y = 1