SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a622b7da266a55fc07959dadafdb3a772df54f137b8976d9394b95070fdd63b8' 
  AND token = 'D4iS/SgQlO8rN+b8/qgoUweya0Nv+ZPiWjFLxVRJC4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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