SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719f401c5d18c6e46843884cf6c6ce0cd19da02d3f57ff500b3a96ee92011393' 
  AND token = '3WwYbIZ18BCIylOa9m2uyUGt9XzGpQW2rXXw4tpiVeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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