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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f462a839ee85a086d53fbdcd3790930ceee1f10374bb2a20b0c54ad2c922e360' 
  AND token = 'BrXy8PtIVQMWNiBIYzzYj6TKv9Z5Ckz68398+SH7j+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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