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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a482a56238d8d5ee94d59ae1129423079a58e3bc4491010eb4a10b23c84bc26' 
  AND token = 'PrXw7tjSeZ61OkN76pOASJw1XiSp2fpVWUpYweHjzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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