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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d38e6cb42d1e042bb49970fd92261d63ecfe99e8b000d959f68502993e7138d' 
  AND token = '9aNDJoPDGJ53bMaJO2BcLB5kvIdoONZnEjxqY0h8BF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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