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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d747df8328d33419b165b6856cd7dea53aad9205a24830151ffb9310d885b35' 
  AND token = '/wTxX2BMMN6xeGdKXHlA/6o7XmVZb0ODrKKRJ5fZb9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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