User meta key search

$meta_query = array(
	array(
		'key'     => 'epithimitieidikotita',
		'value'   => '$eidikotita',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'epithimitesperioxes',
		'value'   => '$epithimitesperioxes',
		'compare' => '=',
		'type'    => 'CHAR',
	),
);