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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f04f5c2ab6624fa40f9311debfff9201280a4b2dc0ef5d239275b703f5ac7f' 
  AND token = 'b2wd//h4Ajzz2HaWN5sFY3x+hPqlmE9l2UFfbdLCBPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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