SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c246b5bb59bf1c13bb6e92de286413f7275f5b6c65eefd47b8a7030bd12339' 
  AND token = 'w1L4NdqxSzq+rm33gBpYHb0mPqOelkBB6LY2ZGLUdGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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