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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fba26595936e233783042729b03756aef0e0583f05fc7506e1f34bf3d525f4' 
  AND token = 'QgSkAPQhiCzZ3ugIAb4lK00k+zU/SPNq3Doe8NZhtLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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