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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2af804e40e0c94c402524cc2207a435a6b7f852b0ee8bdf1b77d95fd8517d1' 
  AND token = 'VOri+bPszLf9mGcHbq57MIANw3mzZ6l1azHPN0AtrTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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