How I get the index value using Hash::extract() on this array

Array(

[168] => Array

    (

        [check] => 0

    )

[169] => Array

    (

        [check] => 1

    )

[170] => Array

    (

        [check] => 1

    )

[171] => Array

    (

        [check] => 1

    )

[172] => Array

    (

        [check] => 0

    )

);

I try it, $a = Hash::extract($arrayCheckBoxCheked,'{n}[check=1]'); pr($a); but it returns:

Array  (      [0] => Array          (              [check] => 1          )        [1] => Array          (              [check] => 1          )        [2] => Array          (              [check] => 1          )    )

I need the index of this array.

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