SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d35fd3f6fbe2614d2470830b86540b319fde12b8c9436a96fff810bd37e43a5' 
  AND token = 'qcNji/IayuAQMrZK46L200wR2yqvmXGx+noP0W+Vuxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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