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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e144d31ba672afc004878f32b9ffddecc476535d1b74bc7404b18af21e9c0164' 
  AND token = 'yDaQpnUUdUByeEFrxd4VRnSmTicKDhdto2bcIIfhSMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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