SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018a926f54f0e8c84ed1cbe8e518c733c2acbcdfd4763d00ffb77756502f193a' 
  AND token = 'uVWzolqvXWemxftBZAhS/sKcR6O5KYDqcw7bzKo6+cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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