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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197da5dcd61da7521894ea05db66133f2753265028445858615ea2e14d741ae1' 
  AND token = 'AHoGhoWmlUcKx3RcVnznuM5b4g7CNaNivXlDBH1UXT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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