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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1d32bfbdd4b3b462c7d5a10a1d7a2d84cf75b27509bf057cbe253d8f0d7267' 
  AND token = '1G5jm5+u3VrqaApuAHSUdMJN/FIiGBuFrmKmqTtnaaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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