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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad305112f61eab6cc27f6d48eae6c6c4a8107df8f62ff21db04c8ebe86f2899' 
  AND token = 'HiiEJ2wbqaKbtzFBtashfBzbKALiuk/VzSiU5f8kU+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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