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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abdbd13ce5adb7f441d2efc97f6cc6746b66630a010c459e613fbc0f1cff099' 
  AND token = 'Oxc2in+h5y7AYhjz64Z+gRdgyCQtq6bRzAgarOUFO2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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