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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd520ab726490ca6a9c952999772f2c36a7ad44b436ac7a7b4cca9540ff0f657' 
  AND token = 'Vedij8+k7XIpN4yMzzxeTwmgHvEPrrrHtQEgZN8xanM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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