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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bf696493549846594050547076ffaa02f3d7e5ab9dcea121f585bc68c3a459' 
  AND token = 'gRiWHU9oTkPekccZYMlL5CVBKwgR1P4yMrc9R/5FdVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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