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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be882b96073ebe0f299bd0cd560b03e6e3f21e1813cc27982f172c9e94167e8e' 
  AND token = 'p4bhTkBRVPwVxCGeTI7bct5lHx6wqxmF/Tf7P9SSEE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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