SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1106ffda8e4b1583629f24c9854f63f93013c8d951c52bf9f764b0b89e3e73ff' 
  AND token = 'u3HEHr2kKgUBqDZAHW9zFtwPSyLC/P9GdvSIPP4D92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}