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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a633a00d7ce5686c14d8010c605bd8ccdf9766050bea4e33deab512366b923ff' 
  AND token = '1JKx1vsL9euJY9jksV5qYJGABroerWxHiA+2e8PcaTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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