I could only find the following core code references for the meta-box-order_ string:
/wp-admin/includes/ajax-actions.php:
update_user_option($user->ID, "meta-box-order_$page", $order, true);
and
/wp-admin/includes/template.php:
... get_user_option( "meta-box-order_$page" ) ...
that’s related to the ordering of meta-boxes.
I doubt your $page value is post_hash, so my first guess is that this comes from a plugin/theme? If not then the user option might be dynamically constructed.
Searching the wide world web gave be only this plugin on GitHub, that uses the meta-box-order_post_hash user meta key.
Thanks to @toscho for the information about the handy y key on GitHub, to retrieve permanent links to GitHub files that I didn’t use in previous answers 😉
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