SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698234cdf1a8a5d25cf7212737135ef1306b2f814fa4375ed8cb227e2ea0fca7' 
  AND token = 'y7+VzGGjeZZiPA50c9XjKAheD76v0pRKVxwS/+rW3CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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