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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb47a1b9b229ddec3c7b36fd0ca46bf0c3be9cb52d31e11f12a4e2cfaec56d0' 
  AND token = 'w9TwzJtpm5r/c56I9qVfTmStgsqba0H+OX74Z7xU1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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