SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35d290b841e6f881e291817c00baf72a3fa99b4329447b29e40bd803e675052' 
  AND token = 'hwueerZbaBFhN8KBCV5xSp8VDkdg/l+3sGR8h/LLrCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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