Have I been hacked?

I was taking a look at mysql slow queries log and found a few interesting queries. Is this just someone/something doing searches for these strings in my posts?

SELECT ID FROM wp_123456_posts
WHERE post_name LIKE ‘_vti_txt%’ AND post_status = ‘publish’;

SELECT ID FROM wp_123456_posts
WHERE post_name LIKE ‘_vti_cnf%’ AND post_status = ‘publish’;

SELECT ID FROM wp_123456_posts
WHERE post_name LIKE ‘%5c%5c%5c%5c%40adminviewerror%’
AND post_status = ‘publish’;

SELECT ID FROM wp_123456_posts
WHERE post_name LIKE ‘%5c%5c%5c%5c%40adminaddadmin%’
AND post_status = ‘publish’;