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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebbc2834c8137357f9f20d123ddbeaa36a501a07349b84cd64168d762989ae7' 
  AND token = 'lFn7ANYoNtckgE7+b2RAtwxvX1CvldThEsRlEqp2tGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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