SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3c24cb481055d86dd77d62cdb5cc66fad37202a9d5f719ed7bdb97461caa59' 
  AND token = 'rZUFKdXLyxIBeu5vjtKJZEPP/YWVEfD8i1GmGT1Ugyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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