SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af6619742deef01c87f8c3584c74f96eed1a1bb409dec7e652e666f63456b32' 
  AND token = 'FrjDnXxp95aaB2Z7KPI9VnRoLYmTKoB0DYZmIvJwqSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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