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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4062067ff43b07aa14c56f6a92ad098bdef5a206559ee27fd3f206ace1496ed' 
  AND token = 'Ka+FO95eyVWswhIOxqjkm/TBgiKnaylA9Ye8rZNLY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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