SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd632d6459f8c58bd7805899c165c82ee871800d7325f8fab28ed4305bc8a6be9' 
  AND token = 'epoMXUZynUvjCwssPM+XJR4cY0BFGFyWXwwYjDLIfys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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