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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17962694c52836e8e858ce1b523b14d96d9c0b6c61fd1cbdd43bf7927a59d7ad' 
  AND token = 'Tz/ecYREfO/Uq5m2iFdzbEZnRvdch2MgV9YZUGdM0bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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