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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d9785e8bb7e11d06dd679972fd65cc1b604d1408afa8ec80ad7b48fb982f6f' 
  AND token = 'OBYMmab8P3eWCZhDwFschBGuLYv8P3/llNsm9SYyMCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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