Get_Posts, only if in both categories

Use WP_Query‘s category__and:

$args = array(
    'posts_per_page' => 5,
    'category__and' => array( 93, 85 )
);

$my_query = new WP_Query( $args );
while( $my_query->have_posts() ):
    $my_query->the_post();
    the_title();
endwhile;

wp_reset_postdata();