test meta

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'sing1',
		'value'   => 'aa',
		'compare' => '=',
	),
	array(
		'key'     => 'sing2',
		'value'   => 'bbb',
		'compare' => '=',
	),
);