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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf9538b9930ed889fe5f5ca8d6b3533a6b7ab49c28eae5a286a0c4a3bb717a9' 
  AND token = 'Hcv1UnKyQOHzr33G/QXuyaX8P5sK084msIM/uiXQeP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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