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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5213d14ac70831103df56e351afcadf9bbb8fa826f1aed8e3d28a596487683' 
  AND token = 'PUeex9zUkzpbCFVl68WYAn2/glqmgD5b62XJLHfT/0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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