SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162498dd6fa43ab2e21d32feff7252c22c32006347baba1ac32d131bbcd65f91' 
  AND token = 'fxIbgeRTUIpR0LNm4zGU7F+BpBtZVgJ3CXzVMYhn1oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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