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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66633312555033455628d558c3501a90cf342044bc27205e6fe8209796c28d36' 
  AND token = 'l12axpZML6R/4ODUFlLOY1eS/cNsDw7JuPL86av4df0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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