Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18134f62791c74383fd54dab46e4423ebeb78ec6cd3e940269a17e42152066f' 
  AND token = 'e/SsrvItUDcBKXQiQdDkMwqNcS7n8NrJleksizIZaqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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