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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48aa42a0f12e75a5c6f890ede1e348ef67b20b7edeec64bb7ac7ef05b4894d30' 
  AND token = 'eBIFY2nuHPx6/0YhBYind9qX9CSxxycr9HNHR86VJsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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