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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17601d6144426905e1bd4f102ee385b15251eb8e01e806842fba6c6800244467' 
  AND token = 'd7DGESiAyvROXrHIM7cuQaAD/2pf79nqgtJau4//V88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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