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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679ea4f13e090ae0809a4e40cc2ee474b25693f9cfbdeff2ee2a37b18be518f0' 
  AND token = 'QaItFX8ya6zMj7nBz7KppTSD9MyLYU3kmM30lauR7vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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