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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f85f93984520738636a5d7d9a970e0a65699556781e21785d9752eeea09d559' 
  AND token = '/VKj48F3zRqmO4ZRjSr5EY0c6QmQFwyWGVBFu4zQGow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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