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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3861df8c26f484d0ee315942e4d2f653afce245392b4d7ab57b6ea399d5d0c63' 
  AND token = 'pfbgpYdMl2VkwMggDnmS43S5uc0Mj3WqtHRBDd3snn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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