Reqtemp

// WP_Query arguments
$args = array(
	'post_type'              => array( 'transport' ),
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'service',
			'value'   => '$service',
			'compare' => 'IN',
		),
		array(
			'key'     => 'option',
			'value'   => '$option',
			'compare' => 'IN',
		),
		array(
			'key'     => 'payload',
			'value'   => '$payload',
			'compare' => '<=',
			'type'    => 'NUMERIC',
		),
	),
);

// The Query
$transport_query = new WP_Query( $args );

// The Loop
if ( $transport_query->have_posts() ) {
	while ( $transport_query->have_posts() ) {
		$transport_query->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();