SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b927843c4162ed2be9a9589b3da6c4d165c7b2b8f90c9c497d48c16f8dca92' 
  AND token = '/RivH7vRgaGHRf6/3n7oJf1nRwNuYIl+PKf+PYGIq+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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