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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac117a4599c2f30fcdc5b7b2b14c4d8e3a92075e811c3f122c728917c92117b5' 
  AND token = '4XGaTL7IZns6bSI5lM9XI8p4J/ptpQyyIrn1fQS3L8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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