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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf4bfcbdf696db6ee1737b420ceeb28ccbffa105baee66471cd5b41ad194571' 
  AND token = 'NVbrCwKNf/4824jA1yRHtChAJRnhIoNEX4Gy4SSkY8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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