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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036cecd49f833ff59cdd941e64e0548a01f3b7e0a3c10a4c0b7b3a96b20dadf9' 
  AND token = 'YDprkaNr0egOiiqcjEJ7P1hVKZOmCCBXZ91OOWDhiMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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