SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0ce5d8363b3b67c1f76ba54dd599243c4f05f5c75421768500a426340301e4' 
  AND token = 'vP+lsQWLhIYPmiQYFxLPf0vV29HyhqXTd1/3bCuqmBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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