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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3d3de1d88e22fefdbdea43eda2581c57729ad73b445c15233c1410eaf2de24' 
  AND token = 'Nq1/nP/QRW3yckwrHzkscIn6/Rpcb/3XGKQatcJ7IOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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