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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba4de392cd41bdabd32dbadf50e402e5664ecfc55309028f6408ce69f8db922' 
  AND token = 'EcbuRCbo6m9otFhfwt8TStpM9iBOWFk466aZXWfIWn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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