Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e0a2dad94d7150da4eff8710beec830998597790fc2a6483a381a8db5c26a3' 
  AND token = '89y2AlF0TJ5ghNYZOhmvQIUg/hypltRWfriiY0xiOuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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