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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef6adba7475ca3b4edec6ad410d44ffdd301e4330b5b1f54d55a9bbde188b8e' 
  AND token = 'bD0YDMvf6GAyEUOT9YtUIAkbDazNwMPGkxkHH8immUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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