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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584ff014bcbd043f42520a126ddbaa012f54fd8b269b542d53886a63a9c7b698' 
  AND token = 'BWNNdPbP/KR88ui27DxrD+IA1juDvEhSJ3EARL1brEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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