SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290a8f092d814414f56b6518170eb94c5511b1e651932f23a3ee905f4657ae7d' 
  AND token = '9OS1ZLIM+Ej4FJ8gBUDai/fKI+qnFTK0DbfGLxIV+8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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