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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f70674d980cc91fdff8b4bf8dea632d9c350853fdee167b82fe3106cfd4127a' 
  AND token = 'f5FL7j/96n2+fWMI7JT5C/GdsmKOeqOtpgcs79hiwqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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