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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd8cee088a32a8cbe51c3c58656c1b7f7c229f0e10cb44e9856cd6f150e8ee3' 
  AND token = 'Zrv+UeZ+TPU+lvrapL2OKlamI9kJpmqaw4EjoMwuZBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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