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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecd1a4d8dcecd9aa2813a61bfc79f9a0c79cb8706ef032e5129ef42cbcf20a8' 
  AND token = '/+ICxzKPfSBiznuw3qLluPClcb7Suap0zsfaH660LBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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