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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206ebb08348bc2d94b36fc6c2c4974db857fd6f5b86c2bd58d690cc914f23948' 
  AND token = '9Gm1Ci8CZSyIkn4CsczvLXDZTp598zQrwqO3SHeWSto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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