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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5583491bd2af733a80e50b791bcf3bf306516861cc7af0f098e4ab226a62efbc' 
  AND token = 'n/srRRxp100ME7jcH2o7tKevgmc1tT7c/awLTqKaaN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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