Searching the views table directly seems to be best approach:
SELECT
v.vid,
v.name,
d.display_title
FROM
views_display d
JOIN
views_view v
USING
(vid)
WHERE
d.display_options LIKE '%<?php%'
ORDER BY v.name;
+-----+----------------------------------------------+-------------------------------+
| vid | name | display_title |
+-----+----------------------------------------------+-------------------------------+
| ID | VIEW MACHINE NAME | VIEW DISPLAY NAME |
+-----+----------------------------------------------+-------------------------------+
