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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47aa862678fd8d6973180a123c1595e69ff0bbf593d19e82e3e1d7599a2cd809' 
  AND token = 'alh3NWqhM4P1QYg/KRqykqJNco9/ZFnS2cwP6kOSGWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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