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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ee71296b8230632eae4669766617005747ed9ceb19d55dbca86b34e08baacf' 
  AND token = 'kJ03MrIZqjKrkyA22NIjbcaq2IL2eNAzUq0UWY2eJTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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