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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1c5f1d3771c1fb45b87d968ef607e0dbea56aaa3ed5f3cba6d59ade31f8d74' 
  AND token = 'xStImsWsRdcQzT5LGh0FCa68VKNNaZSsqoVg3b5+4lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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