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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83774671ef90f02de25b6811ca31bae7a44c420c73f5fdf3e2decf32399ec958' 
  AND token = '76bjzI9DtWq/7oionNNh7OBfJnbvtV36ExDQnEKjDHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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