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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bf0d6f2a67b5b98442ada1e6899f9ff76f8805dfc5392452a9b92c88d786f7' 
  AND token = 'JMAgLUv6/3J0JmSYTmmEm4IEEf5qFV/T9UimffZ8a/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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