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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825ef4252e41a1d6d6f5118e4b0d01b76606f8b6abb36204254df56df079dff2' 
  AND token = 'N/mq634lahvKLCrknv60ylhfjCB7JJ46apgTism+xgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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